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saw arm by removing the guide lock knob and
sliding the assembly from the arm.
3. Use a drift to knock out the pin until until the
bearing can be removed.
4. Replace the bearing and press the shaft back
into the seat.
5. Reinstall the bearing assembly in the arm.
6. Reinstall the blade according to instructions 6
through 9 in Changing blades.
7. Adjust the back up bearing spacing according to
instructions in Adjusting back up bearing clearance.
Adjusting the bearing guide seats for blade
vertical
1. Install a new blade according to instructions in
Changing blades.
2. Adjust the guide bearings according to instruc-
tions in Adjusting guide bearings.
3. Adjust the back-up bearing according to instruc-
tions in Adjusting back-up bearings.
4. With the arm in its full horizontal position and the
blade guides moved apart to clear the widest
possible cutting area, clip a scale to the blade, to
provide a vertical reference surface.
5. Place a machinist's square on the saw base,
against the scale. See Figure 14.
6. Loosen the guide bearing seat attachment bolt
slightly and, using a wrench on the bearing seat,
adjust the angle of the seat so the blade is vertical.
(There is a small amount of side relief between the
seat and guide bar to allow for this adjustment.)
7. Tighten the seat attachment bolt.
8. Move the scale and square to the other side of
the exposed blade and repeat steps 4, 5, 6 and 7,
above.
14
Figure 14: Adjusting the saw blade for vertical. Be
sure to do this operation on both of the bearing
guide seats so the blade is perfectly vertical along
its entire exposed cutting surface.
Test cutting to verify adjustment accuracy
Test cuts can be used to determine whether or not
you have adjusted the blade accurately. Use 2 inch
bar stock to perform these test cuts, as follows:
1. With the bar stock securely clamped in the vise,
make a cut through the bar stock. (See Figure 15.)
2. Mark the top of the bar stock.
3. Move the bar stock about 1/4 inch past the blade
so you can begin a second cut.
4. Rotate the bar stock 180 degrees so the mark
you made is now at the bottom of the cut.
5. Make a cut through the bar stock.
6. Use a micrometer to measure the thickness
variation between the top and bottom of the disc you
have cut from the bar stock. Unless things are truly
perfectly aligned, there is almost certain to be a
certain amount of "wedge" to the shape of the disc
you have cut. The saw blade can be considered
correctly adjusted when the variation measured is
no more than .012 inch across the face of the disc.
If you do not have a 2 inch bar stock available for a
test cut, use a larger diameter test work piece
rather than a smaller one. The maximum thickness
variation on any test piece should be no more than
.003 inches, per side, per inch of stock diameter.
Figure 15: Step-by-step method to produce a test
disc which can be measured for "wedge" - a mea-
surement for testing cutting accuracy.
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